A naked patient undergoes surgery in a warm room. Determine the ratio Pe/Pe. where Pe is the heat-power lost from the patient due to air convection and Pe is the heat-power lost from the patient due to evaporation. Take the skin temperature to be 32 °C, the room temperature to be 29°C, the total body area to be 1.3 m2, the emissivity e = 1.0, and the convection of coefficient, q = 7.1 WI(m2.K). Take water to be lost from the patient by evaporation at a rate of 40 g/(m?.hr) and assume this to be pure water. Take any other coefficients required from the course notes.
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
The skin temperature
The room temperature
The total body area
The emissivity
The convection coefficient
Heat lost from skin through convection
The rate of water evaporated from unit area of the skin
The total amount of water evaporated in one hour
The total amount of water evaporated in one second
Latent heat of vaporization of water
Heat absorbed for evaporation of water from skin
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